-The subproduct identification record has tag code @samp{3}. It
-consists of a single string field giving additional information on the
-product that wrote the portable file.
+The author identification record has tag code @samp{2}. It is
+optional. If present, it consists of a single string field giving the
+name of the person who caused the portable file to be written.
+
+The subproduct identification record has tag code @samp{3}. It is
+optional. If present, it consists of a single string field giving
+additional information on the product that wrote the portable file.